3905172 has 60 divisors (see below), whose sum is σ = 10824660. Its totient is φ = 1223424.

The previous prime is 3905149. The next prime is 3905173. The reversal of 3905172 is 2715093.

It can be written as a sum of positive squares in 2 ways, for example, as 1726596 + 2178576 = 1314^2 + 1476^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3905173) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5154 + ... + 5862.

It is an arithmetic number, because the mean of its divisors is an integer number (180411).

Almost surely, 2^3905172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3905172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5412330).

3905172 is an abundant number, since it is smaller than the sum of its proper divisors (6919488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3905172 is a wasteful number, since it uses less digits than its factorization.

3905172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 3905172 is about 1976.1508039621. The cubic root of 3905172 is about 157.4756424918.

The spelling of 3905172 in words is "three million, nine hundred five thousand, one hundred seventy-two".